Subject:
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Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 1 Oct 1999 16:54:27 GMT
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Viewed:
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646 times
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Lars C. Hassing wrote in message <938787015.279086@ns.cci.dk>...
> I agree with John Van in that we need three keywords: CCW, CW, UNKNOWN.
> As the rendering program is going to keep track of the number of mirrorings • of
> the transformations (or simply if the total transformation is a mirroring), • we will
> need a way to tell what is inside-out side of e.g. cylinder primitives.
> Then STUD2.DAT could use:
> 0 CCW
> 1 16 0 -4 0 4 0 0 0 4 0 0 0 4 4-4cyli.dat
> 0 CW
> 1 16 0 -4 0 6 0 0 0 4 0 0 0 6 4-4cyli.dat
Hold on.
Why not just have a button in the CAD program to turn the part inside-out by
automatically manipulating the orientation matrix in the parent dat file,
instead of having these extra CW/CCW flags all over the place?
The orientation matrix as initially read from a DAT file could be used as a
reference to be compared with the final contatenated orientation matrix when
the primitive actually gets rendered to decide whether it's supposed to
appear inside-out or not.
Maybe I'm missing something.
-Gary
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